package com.maxqiu.demo.CountDownLatch;

import java.util.concurrent.CountDownLatch;

/**
 * 演示 CountDownLatch
 *
 * @author Max_Qiu
 */
public class CountDownLatchDemo {
    // 6个同学陆续离开教室之后，班长锁门
    public static void main(String[] args) throws InterruptedException {
        // 创建CountDownLatch对象，设置初始值
        CountDownLatch countDownLatch = new CountDownLatch(6);
        // 6个同学陆续离开教室之后
        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " 号同学离开了教室");
                // 计数 -1
                countDownLatch.countDown();
            }, String.valueOf(i)).start();
        }
        // 等待
        countDownLatch.await();
        System.out.println(Thread.currentThread().getName() + " 班长锁门走人了");
    }
}
